Individually Regulated Dual-Output IPT System Based on Current-Mode Switching Cells

Based on the current-mode switching cell (CMSC), an inductive power transfer (IPT) system with dual-output is proposed in this letter. In the proposed IPT system, two CMSCs are inversely connected in series at the Rx side. Two CMSCs operate in the positive half-cycle and in the negative half-cycle of the Rx coil current, respectively. The dual output voltages can be regulated independently. The circuit structure of the CMSC is quite simple and helps to make the Rx side more compact. The control scheme is based on Rx-side real-time regulation and thereby wireless communication links are not required. Additionally, zero voltage switching (ZVS) is ensured for all switches. In order to verify the theoretical analysis, an experimental prototype with 20V/3.3A and 5V/3A outputs is fabricated, and the maximum efficiency can reach 92.8%.